Fire box



F L. MQGAHAN, DECD.

V- K. WALKER. ADMINISTRATRIX,

FIRE BOX.

APPLICATION FILED JAN. 17, 1919.

Patented July 18, 19226 INVENTORI srar FREDERICK L. McGAI-IAN, 0F LOS ANG ELES, CALIFORNIA; VIOLA K. WALKER, ADMIN- ISTRATRIX 01' SAID FREDERICK L. MGGAI-IAN, DECEASED, ASSIGNOB TO THE PUR- PQSED MIND DEVELGPMENT $ECURITY ASSOCIATION OF THE WORLD, A TRUST COMPANY.

i FIRE 130x.

insects.

Specification of Letters Patent.

rat neeuaai is, 1922.

Original application filed January 3, 1918, Serial No. 210,146. Eatent No. 1,292,399, dated January 21, 1919. Divided and thisapplication filed January 17, 1919. Serial No. 271,716.

To all whom it may concern:

Be it known that I, FREDERICK L. MGGA- HAN, a citizen. of the United States, residing at the city of 1:105 .rrngeles, in the county of Los ingcles and State of California, have invented certain new and useful Improvements in Fire Boxes, of which the following is a specification.

This application is a division from the application of the sameinventor for patent for locomotive filed January 3, 1918, Serial 210,146, which became Patent 1,292,399, Jan. 21, 1919, and relates more particularly to an alternative form of construction of fire-box with arch therein.

In the accompanying drawings forming part of this specification, in which like numbers of reference denote like parts wherever they occur, 9

Figure 1 is a sectional view showing the construction of the fire-box and the location of the nozzle-inlets thereinto for powdered fuel, this section being taken substantially on the line 11 in Figure 2;

Figure 2 is a fragmentary side elevation of an engine cab showing the furnace wall and fire-box in section, and the fuelfeed partially in side elevation.

Thefire-box 52 is located in the usual re lation to the cab 2, and fuel, preferably pulverized, is normally fed to the fire-box 52 by a mechanical stoker consisting of the endless screws or other suitable force-feed 3, their flexible joints 1 and pipes 5 telescoping with inlet pipes 6 which communicates with nozzles 7. It is to be understood that parts numbered respectively from 3 to 7, both inclusive, are duplicated upon the opposite sides of the engine cab. Thus the fuel is fed into fire-box 52 out of nozzles 7 located respectively on both sides of the fire-box 52.

Inlet pipes 6 lead to nozzles 7, and at their other ends telescope pipes 5, which, by flexible joints 4, communicate with the source of powered fuel supply 8. Thus screw 3 forces the powdered fuel through joints 4,

pipes 5 and 6, and nozzles 7 into the firebox" 52. The usual crown sheet 1 is provided.

The fire-box 52 is provided with the usual grate-bars 9 and fire tubes 10 associated with the tube sheet 1d.

Water tubes 11 support fire-brick arch 12 which partitions the fire box off into communicating chambers. It will be observed that Zles 7, oppositely located and adapted to dischar 'e toward each other from opposite sides of the fire-box 52, meets at the ignitionpoint 13 in the fire-box underneath the arch 12. Combustion there occurring, the flames break over the top of'the arch 12, following the course indicated by the arrow in Figure 2, to reach the fire-tubes 10.

By the use of powdered fuel and this arrangement of the fire-box, the advantage results that combustion instantly occurs upon the introduction of fresh particles of fuel into the fire-box 52. The fact that the fuel is in a finely comminuted state also facilitates combustion. The entrance of fuel into the fire-box and the exit of the products of combustion therefrom through the fire tubes are facilitated by the action of any suitable suction means in proper relations with the discharge ends of said tubes.

It may be stated that the force-feed screw 3, may be continuously operated. Thus con tinuous feeding of the powdered fuel is produced, which is preferable to the interrupted or spasmodic firing by firemen, as it results in greater certainty and regularity of fuel supply, which is necessary for a regular and reliable head of steam. More complete combustion of the fuel is obtained by this apparatus.

Having thus described this. invention, I

izontal fire tubes leading from one of the end walls, water tubes within the fire-box and extending diagonally from one end wall at a 10 charge the fuel delivered there-through toward each other, the point of ignition being at the center of the fire=box be1ow said partition, means for creating a draft through the fire-box whereby the products of combustion traverse the chambers and exit 15 through the said fire tubes. I

In testimony whereof I hereunto afiix my signature.

FREDERICK L. lWoGAHAN. 

